Switching motor control apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 23, 1999
Grant Date -
N/A
app pub date -
Dec 4, 1997
filing date -
Dec 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor control apparatus for controlling a motor is provided. The motor has an output power stage and a relay allowing power to be connected to the output power stage. The apparatus comprises a microprocessor providing a PWM cycle delivered through a capacitor to a transistor. The microprocessor activates the transistor for a first predetermined amount of time during the PWM cycle causing the relay to actuate the output power stage thereby driving the motor. A detection mechanism within the microprocessor for detecting a fault in the main output transistor. The circuitry disengages the relay from the output power stage thereby causing the motor to cease being driven.
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